I don't have personal experience with an optical network (I use ethernet to connect to my ultraRendu, which outputs USB to my DAC), nor with coax outside of regular ol' cable boxes. However, I've read some favorable SQ comments about converting an ethernet signal to fiber optic from an upstream location and running the fiber out to wherever your audio system is, where a device like Sonore's opticalRendu can convert the fiber signal to USB out to your DAC.
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